Heat mat cord strain relief device



FIG. 1 is a top front right view of a heat mat cord strain relief device shown in an environment of use;

FIG. 2 is an alternate top front right view of a heat mat cord strain relief device;

FIG. 3 is a bottom front left view of a heat mat cord strain relief device shown in an environment of use;

FIG. 4 is an alternate bottom front left view of a heat mat cord strain relief device;

FIG. 5 is a top plan view of a heat mat cord strain relief device;

FIG. 6 is a right side elevational view of a heat mat cord strain relief device;

FIG. 7 is a bottom plan view of a heat mat cord strain relief device;

FIG. 8 is a left side elevational view of a heat mat cord strain relief device;

FIG. 9 is a front elevational view of a heat mat cord strain relief device; and,

FIG. 10 is a rear elevational view of a heat mat cord strain relief device.

Dashed lines represent unclaimed environment and form no part of the claimed design. 

CLAIM The ornamental design for a heat mat cord strain relief device, as shown and described. 